What is Your Hair and Health relationship? (2)

A healthy head of hair is easy to spot. It's full, shiny and lustrous with no flakes, frizzies or other visible damage. But what about when your crowning glory isn't quite so glorious? In some cases, it might be a harbinger of health problems—or it could simply mean that you're spending too much time with the blow dryer.

Going gray

Some people start finding those wiry gray strands as early as their 20s, while others hold onto their natural color well into their 40s. The cause is unrelated to how healthy—or unhealthy—you are. As with so many things, it turns out you can blame (or thank) your parents for the rate at which your hair turns gray. "It's mostly genetic," Kauvar says, "so if your parents grayed early, it is likely you will too." The hair that's already on your head doesn't lose pigment. But as you age, there is a decrease in melanin production in the hair bulb (or root). So when new strands start to grow, they may come in with less—or no—pigment, thanks to that decrease in melanin. The change happens most quickly in Caucasians, 50 percent of whom will be at least 50 percent gray by age 50.

(source:health.msn)